Automatic regulation of electrical circuits



(No Model.)

W. W. GRISGOML.

AUTOMATIC REGULATION OF ELECTRICAL GIRGUI TS.

Noi 407,006; Patented July 16, 1889.

(No Model.) v, 2 Sheets-Sheet 2.

W. W. GRISOOM.

AUTOMATIC REGULATION OF ELEGTRIGAL CIRCUITS. No. 407,006. PatentedJu1y16, 1889.

7/14.." 7% 35 W GflozmeW %D UNITED STATES PATENT OFF CE.

TVILLIAM Vt. GRISCOM, OE HAVEREORD COLLEGE, ASSIGNOR TO THE ELEC- TRODYNAMIC COMPANY, OE PHILADELPHIA, PENNSYLVANIA.

AUTOMATIC REGULATION OF ELECTRICAL CIRCUITS.

SPECIFICATION forming part of Letters Patent No. 407,006, dated July 16,1889.

Application filed February 11, 1389. Serial No. 299,552. (No model.)

To all whom, it may concern: the dynamo-circuit when saidcircuitisbroken, Be it known that I, IVILLIAM \V. GRISOOM, either byaccident or design, and is calculated a citizen of the United States,and a resident to prevent in jury to the prime motor by reason ofHaverford College, in the county of Montof the increased speed to whichthe uniform 55 gomery and State of Pennsylvania, have insteam-pressurewould subject it were the load vented certain new and usefulImprovements thus entirely removed, practically entirely rein theAutomatic Regulation of Electrical Cirmoved, or greatly varied. Thisconsists of an cuits, of which the following is a specification.arrangement of apparatus for bringing into My invention is animprovement in the anoperation a device for controlling the admis- 60 [Otomatic regulation of electric current genersion of steam to thecylinder. I prefer the arated by a dynamo-electric machine. rangementshown, which consists of an auto- I provide a prime motor,which ispreferably matic governor normally held out of action by a steam-enginehaving adequate boiler capaean electro-magnet in the circuit of thedynamo, ity and means for admitting steam in equal but which is throwninto action by a change 65 quantities at each stroke of the piston, thein the electric current ofapredetermined charsteam being maintained asnear to uniform actor as its complete failure or its abrupt fallpressure as possible, whatever the speed of to an ineffective orinappreciable point.

operation. I belt such an engine to the dy- The accompanying drawingsillustrate my namo in the usual manner, but normally the invention. 7ogovernor for varying or con trolling the admis- Figure 1 shows the primemotor drivin the sion of steam is inactive and out of action.dynamo,which in turn supplies the working- Let us assume a pressure ofone hundred circuit with electricity. Fig. 2 is a detail pounds at thecylinder and a rotation of three showing the means for controlling thesteamhundred per unit of time. The electric curinlet to the enginethrough the medium of a 75 2 5 rent generated by the dynamo used is,say, governor normally out of action.

fifty amperes and five hundred volts. This E is a steam-engine having apiston P, cylassumes a resistance in circuit of ten ohms. inder C,fly-wheel F, and pulley-wheel TV. It will be noticed that one hundredpounds Adequate boiler capacity is available through steam-pressureistranslated into fifty amperes the pipe Z. t 80 3c of current under theexistence of the assumed D is a dynamo-electric machine driven fromconditions. If, now, the resistance in the cirthe engine by belt 13 andsupplying workingcuit with the dynamo be increased to twenty circuit 10,containing lamps 1. The workingohms, the current will tend to drop totwentycircuit and dynamo are connected by main five amperes, but whilefalling the rotations of leads 2 and 3. 8.5 the fly-wheel and the speedof the piston 1111- The enginc=governor Gis the ordinary form der thepressure of steam assumed will inof ball-governor connected withsteam-inlet crease, the rotations of the dynamo-armature valve o by acompound lever Z. There is a will be increased, and the electro-motiveforce bevel-gear on the governor-shaft meshing with will rise until thefall in current is stopped, a similar gear located on a bearingjournaled 90 when it will rapidly rise again until the elecat rightangles thereto. On bearing y there tro-motive force reaches one thousandvolts, is a loose pulley p and a fast pulley p. The when the normalcurrent intensity of fifty belt I) connects the fiy-wheel shaft wit-hthe amperes is restored. This is automatic regubearing y, and may beplaced upon either lation of current intensity by uniformity of loosepulley p or fast pulley p. 5 steam-pressure. It is equally true that ifthe m is a solenoid electro-magnet located in resistance. in circuit bereduced results oppothe main lead 2. Its core is jointed to a threesiteto those described in case of increased rearmed lever L, held in aretracted position by sistance will follow at the engine. the spring orretractor R. The third arm of My invention consists in applying to thisthis lever is in the form of a belt-shifter comarrangementof apparatusan automaticmeans. posed of an arm and a bifurcated terminal forproviding against a failure of current in having one bifurcation uponeach side of belt I).

As the apparatus is-shown, the entire apparatus is idle, and as nocurrent is flowing in the magnet in the retractor R has caused belt 1)to take up its position upon fast pulley 1). As soon as the enginestarts and current is generated in circuit 2 3 magnet on will draw itssolenoid inward, and the belt-shifter will. cause belt I) to take up itsposition on loose pulley 1), when it will be out of action. As aboveexplained, the steam-pressure being substantially constant, the strengthof current will be maintained constant by automatic variations in speedof the engine; but should the current fail or abruptly decrease, so asto practically remove the load from the engine, the magnet in willrelease its armature-core and the governor will be thrown into operationto control the inlet-valve of the engine.

\Vhat I claim, and desire to secure by Letters Patent, is-- 1. Thecombination of a prime motor, a suitable source of power-such as steam,water, or gas-a pipe or passage for conducting or applying such power tosaid motor, a normal] y-open valve or gate controlling said passage, adynamo-electric maehin e operated by said prime motor, an electricalcircuit containing said dynamo, and an eleetro-maguet havinganormally-attracted armature mechanically connected with said valve,whereby the failure of current in said circuit releases said valve andcloses the gate or passage,substantially as described.

2. The combination of a prime motor, a suitable source of powersuch assteam, water, or gas-a pipe or passage for conducting or applying saidpower to the motor, a normallyopcn valve or gate controllin saidpassage, a governor normally out of action for operating said gate orvalve, a dynamo-electric machine operated by said prime motor, anelectrical circuit containing said dynamo, an. electromagnet located insaid circuit having a normally-attracted armature, and means forestablishing an operative connection between said governor and a movingpart of the mo tor controlled by said armature, whereby the failure ofcurrent in said circuit releases said valve and closes the gate orpassage, substantially as described.

\VILL'IAM W1 (,ll'tISCOM lVitnesses:

LA'wnnNoE T. PAUL, JNo. J. \VILKINSON.

